<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div {
				width: 200px;
				height: 200px;
				border: 1px solid red;
				/* padding-left: 20px;
				padding-top: 30px; */
				/* padding: 20px; */
				/* padding: 10px 30px; */
				padding: 10px 30px 40px;
			}
		</style>
	</head>
	<body>
		<div>内边距就是内容和边框的距离</div>
	</body>
</html>
